642260865 has 8 divisors (see below), whose sum is σ = 1027617408. Its totient is φ = 342539120.

The previous prime is 642260863. The next prime is 642260869. The reversal of 642260865 is 568062246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 642260865 - 2¹ = 642260863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642260863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21408681 + ... + 21408710.

It is an arithmetic number, because the mean of its divisors is an integer number (128452176).

Almost surely, 2^642260865 is an apocalyptic number.

It is an amenable number.

642260865 is a deficient number, since it is larger than the sum of its proper divisors (385356543).

642260865 is a wasteful number, since it uses less digits than its factorization.

642260865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42817399.

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 642260865 is about 25342.8661559816. The cubic root of 642260865 is about 862.7874513424.

The spelling of 642260865 in words is "six hundred forty-two million, two hundred sixty thousand, eight hundred sixty-five".